An 8.0 kg object moving with an initial velocity of 8.0 m/s on a surface comes to rest due to friction after it travels a horizontal distance of 10 m
What is the coefficient of kinetic friction between the object and the surface? Use g = 10 m/s2. A)
0.13
B)
0.25
C)
0.32
D)
0.43
E)
0.80
C
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a. true b. false
Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of
A) lesser impulse in stopping. B) longer time to stop. C) both of these D) none of the above
If the wavelength of a photon is doubled, what happens to its energy?
A) It is reduced to one-half of its original value. B) It stays the same. C) It is doubled. D) It is increased to four times its original value. E) It is reduced to one-fourth of its original value.
An 8.0-kg object moving 4.0 m/s in the positive x direction has a one-dimensional collision with a 2.0-kg object moving 3.0 m/s in the opposite direction. The final velocity of the 8.0-kg object is 2.0 m/s in the positive x direction. What is the total kinetic energy of the two-mass system after the collision?
a. 32 J b. 52 J c. 41 J d. 25 J e. 29 J